JP2007124025A - Portable telephone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable telephone capable of more integrated display even if using a plurality of screens for displaying one image. <P>SOLUTION: Sub LCDs 15L, 15R are stored inside a display unit 3 and can be withdrawn by sliding horizontally. When the sub LCDs 15L, 15R are being stored, an image is displayed only on a main LCD 6. When the sub LCDs 15L, 15R are withdrawn, the image being displayed on the main LCD 6 is displayed integrally on the main LCD 6 and the sub LCDs 15L, 15R. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile phone including an image display device that displays characters or images.

  Currently, mobile phones that are widely spread have not only telephone communication functions but also functions as data communication terminals such as an Internet access function and an electronic mail function. In addition, mobile phones equipped with a digital camera function and movie function that can record still images and moving images have also appeared. A mobile phone having these functions is provided with an image display device for displaying characters and images. As this image display device, a liquid crystal display device is generally used. However, since the screen size is limited by the size of the mobile phone body, the size of about 2 to 3 inches has become mainstream. Therefore, the number of characters that can be displayed on the screen and the size of still images and moving images are limited, making it difficult to display a sufficient amount of information.

  Therefore, in the past, mobile phones that have been devised to enlarge the screen of the image display device have been proposed. For example, Patent Document 1 discloses a server that distributes large screen data by treating the screens of the image display devices provided in each of a plurality of mobile phones as one screen. That is, when the screens of a plurality of mobile phones registered in the server are arranged in a line and an image distributed from the server is viewed, an image in which the screens of the plurality of mobile phones are regarded as one large screen is displayed. The

  In addition, in the mobile phone disclosed in Patent Document 2, the rear display unit that is normally located on the rear side of the front display unit and displays the content independent of the display content of the front display unit can be developed by a hinge. When the rear display unit is unfolded, the screen of the front display unit and the screen of the rear display unit are arranged on the left and right sides of substantially the same plane. Then, when the rear display unit is in a developed state, the screen is enlarged by performing image display in which the two screens of the front display unit and the rear display unit are regarded as one screen.

JP 2003-5947 A JP-A-2005-223507

  However, in order to display a large screen image on the screen of a mobile phone by the method disclosed in Patent Document 1, a plurality of mobile phones are required, which is suitable for an individual to view a large screen image. It's hard to say. On the other hand, the mobile phone disclosed in Patent Document 2 realizes a large screen in one mobile phone, but when the rear display unit is expanded, the screens of the front display unit and the rear display unit are displayed. Are aligned on the left and right on substantially the same plane, the frame part of the front display unit and the frame part of the rear display unit are adjacent to each other between the two screens, and the interval between the two screens is inevitably widened. End up. Therefore, if the screen size of the mobile phone is taken into consideration, the distance between the two screens will be too far away, and even if both the front display unit and the rear display unit are regarded as one screen and one image is displayed, For the viewer, an impression that the image is divided may be given, and it may be difficult to perform integral display.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile phone that enables more integrated display even when displaying one image using a plurality of screens.

  In order to achieve the above object, the present invention provides a mobile phone that communicates with the outside, a first image display device that includes a display screen that displays an image and a frame that surrounds the display screen, And a frame part surrounding the display screen, provided at a position hidden on the back side of the first image display device, and slid in the horizontal direction of the display screen of the first image display device When the second image display device that can be pulled out and the second image display device are pulled out, one image is integrated with the display screens of the first and second image display devices. The display screen of the second image display device is in a position parallel to the display screen of the first image display device when pulled out, and the second image display device is displayed. Pull out the image display device to the maximum Even when the, frame portion of at least the second image display device is characterized in that the remains hidden on the rear side of the first image display device.

  Here, “at least the frame portion of the second image display device” means that the display screen of the second image display device is not limited to the frame portion when the second image display device is fully pulled out. Including a part of which remains hidden behind the first image display device. Further, the number of the second image display devices is not limited to one, and two image display devices may be provided and can be pulled out in the horizontal direction from the right side and the left side of the first image display device. In this case, the display control unit integrally displays one image on three screens of the screen of the first image display device and the screens of the two second image display devices.

  According to the mobile phone described above, when the second image display device is pulled out, the first and second display screens are arranged side by side, and one image is integrally displayed on both display screens. . In addition, when the second image display device is pulled out, at least the frame portion of the second image display device is hidden behind the first image display device on the display screen of the second image display device. Only the frame portion of the first image display device exists between the screens of the second image display device and the interval between the two display screens can be reduced. For this reason, when one image is displayed on the screens of both image display apparatuses, a more integrated display is possible.

  The present invention further includes a detection unit that detects a state in which the second image display device is pulled out in the mobile phone, and the display control unit is configured to display the second image display by the detection unit. When the state in which the device is pulled out is not detected, the image is displayed only by the first image display device, and when the state in which the second image display device is pulled out is detected by the detection means, The image displayed on the image display device is integrally displayed on the screens of the first and second image display devices.

  According to the above mobile phone, the image displayed on the first image display device when the second image display device is hidden behind the first image display device is the second image. When the display device is pulled out, it is displayed integrally on both display screens of the first and second image display devices. Thereby, since the display switching when the second image display device is pulled out is automatically switched, it is possible to reduce the trouble of the user regarding the display switching.

  Further, according to the present invention, in each of the mobile phones described above, the display control unit has a storage area corresponding to each pixel constituting the display screen of the first image display device, A first image storage means for storing image data to be displayed on the display screen of the first image display device in the storage region, and a storage region corresponding to each pixel constituting the display screen of the second image display device And a second image storage means for storing image data to be displayed on the display screen of the second image display device in the storage area, in the display screen of the second image display device Of the two sides in the vertical direction, the storage region other than the storage region in the second image storage unit corresponding to the pixel corresponding to the display screen region having a predetermined width from the side opposite to the pull-out direction, Screen of second image display device It is characterized by storing the image data to be displayed.

  According to the above-described mobile phone, an image is displayed in a display screen area having a predetermined width from a side opposite to the pull-out direction among two sides in the vertical direction on the display screens of the two image display devices. Disappear. For this reason, the maximum drawing position of the second image display device can be set to a position where a display screen area where the image is not displayed is hidden behind the first image display device. That is, since the portion hidden behind the first image display device can be made larger than when the position where only the frame portion is hidden behind the first image display device is set as the maximum drawing position, the second image is displayed. The strength for supporting the display device can be increased.

  According to the mobile phone of the present invention, even when one image is displayed using a plurality of screens, a more integrated display can be performed.

  Hereinafter, a mobile phone according to a preferred embodiment of the present invention will be described with reference to the drawings. The mobile phone described below performs telephone communication and data communication via the Internet wirelessly via a base station (not shown).

  1A and 1B are a front view and a side view showing the appearance of the mobile phone 1 according to the present embodiment, wherein FIG. 1A is a front view, FIG. 1B is a left side view, and FIG. 1C is a right side view. The mobile phone 1 has a foldable structure including a main body 2 and a display unit (first image display device) 3, and the front view of FIG. 1A shows a state in which the display unit 3 is opened. ing. In FIG. 1, an antenna 4 for transmitting and receiving a radio signal exchanged with the base station described above is provided in the upper part of the display unit 3 in the drawing. A speaker 5 is provided above the front of the display unit 3 for listening to the voice of the communication partner when performing telephone communication via the base station described above. A liquid crystal image display device (hereinafter referred to as a main LCD) 6 is provided below the speaker 5, and the telephone number input when making a call from the mobile phone 1, calls the mobile phone 1. The other party's phone number, image data downloaded via the Internet, and contents of sent and received e-mails are displayed.

  The main body 2 is provided with a numeric keypad 7 for inputting a telephone number and characters. The numeric keypad 7 is composed of the same keys as those provided in a so-called push-phone type telephone, and 10 keys corresponding to numbers “0” to “9” (hereinafter referred to as numeric keys), It consists of a total of 12 keys, two keys corresponding to the symbols “*” and “#”. Further, hiragana and alphabet are appropriately associated with each numeric key, and are used when inputting characters or the like while the accessory function of the mobile phone 1 is being executed. A transmission key 8 and an end key 9 are provided above the numeric keypad 7. The call key 8 is used when receiving a call received from the mobile phone 1 and when making a call from the mobile phone 1 by inputting a telephone number using the numeric keypad 7. The end key 9 is used for ending a call using the mobile phone 1 and ending various functions of the mobile phone 1. The end key 9 also serves as a power switch for the mobile phone 1.

  Between the outgoing key 8 and the end key 9, there is provided a disk-shaped multi-directional key 10 that can indicate four directions, up, down, left, and right, and is displayed on the main LCD 6 in various functions of the cellular phone 1. Used when selecting multiple options. Here, the mobile phone 1 is assumed to have a schedule function, an address book function, a calculator function, and a memo pad function, for example. “↑”, “↓”, “→”, “←” marks are attached to the surface of the multi-directional key 10, and when the position of the “↑” mark is pressed, an upward direction is indicated. When the mark positions of “↓”, “→”, and “←” are pressed, the downward, rightward, and leftward directions are respectively indicated. At the center position of the multi-directional key 10, there is provided a decision key 11 that operates independently of the multi-directional key 10. For example, the multi-directional key 10 selects a plurality of options displayed on the main LCD 6. It is used when confirming the contents. A first command key 12 is provided above the outgoing key 8, and a second command key 13 is provided above the end key 9. These command keys 12 and 13 are appropriately assigned commands used in the executed functions when various functions of the mobile phone 1 are executed. Hereinafter, the ten key 7, the call key 8, the end key 9, the multidirectional key 10, the enter key 11, the first command key 12, and the second command key 13 are collectively referred to as an operation unit. Below the numeric keypad 7, a microphone 14 is provided for inputting voice to be transmitted to the other party when the mobile phone 1 is performing telephone communication.

  Further, as shown in FIGS. 1B and 1C, the display unit 3 accommodates sub LCDs 15L and 15R (second image display devices) on the back side of the main LCD 6, and the sub LCD 15L. , 15R can be manually slid out in the front direction of the paper in FIGS. 1B and 1C (the screen of the main LCD 6 in FIG. 1A, the horizontal direction). .

  Here, a state where the sub LCDs 15L and 15R are pulled out will be described with reference to FIG. FIG. 2 is a front view of the mobile phone 1 in a state in which the sub LCDs 15L and 15R are pulled out to the maximum. In this figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in this figure, when the sub LCDs 15L and 15R are pulled out, screens 16L and 16R surrounded by the frame portion FL appear, and various images are displayed together with the main LCD 6 as will be described later. Further, the sub LCDs 15L and 15R are shown in broken lines even in the fully pulled out state, that is, in the horizontal direction of the sub LCDs 15L and 15R, from the side on the display unit 3 side (in the sub LCD 15L, the left side in FIG. The direction and the sub LCD 15R are accommodated in the display unit 3 by a predetermined width w toward the right in FIG. Accordingly, a part of the screens 16L and 16R of the sub LCDs 15L and 15R (the hatched portions in the figure) is hidden behind the display unit 3, and the screen of the main LCD 6 and the screens of the sub LCDs 15L and 15R are hidden. The interval is only the width D of the frame portion of the main LCD 6.

  The display unit 3 is provided with detecting means for detecting whether or not the sub LCDs 15L and 15R are pulled out to the maximum. Hereinafter, this detection means will be described with reference to FIG. FIG. 3 is a diagram for explaining the structure of the detection means described above, and illustrates a part of the lower side of the display unit 3. FIG. 3 shows a state in which a part of the main LCD 6 is broken to illustrate the detection means. In the following, the structure of the detection means corresponding to the sub LCD 15R will be described, but the detection means corresponding to the sub LCD 15L has the same structure.

  In FIG. 3A, a metal ball MB urged in a downward projecting direction by a spring (not shown) is attached to the left bottom portion of the sub LCD 15R. In addition, a concave portion 17R that fits the above-described metal ball MB is formed in the display unit 3 on the right side of the storage unit bottom surface 3a (see FIG. 3B) of the sub LCD 15R. As shown in FIG. 3C, two terminals 18R and 19R made of a thin metal plate are provided on the inclined surface s of the recess 17R. Then, as shown in FIG. 3B, when the sub LCD 15R is pulled out and its maximum position, that is, when the metal ball MB reaches the position of the recess 17R, the metal ball MB protrudes by the biasing force of the spring, and the recess 17R Mating. At this time, the terminals 18R and 19R are electrically connected by the metal ball MB, and it is possible to detect that the sub LCD 15R is pulled out to the maximum by this conduction.

  Next, the internal configuration of the mobile phone 1 will be described with reference to FIG. In this figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. In FIG. 2, the control unit 20 controls telephone communication performed using the operation units 7 to 13, the speaker 5, and the microphone 14, and executes programs for realizing various functions of the mobile phone 1. To do. Further, visual information (for example, images and characters) associated with these processes is displayed on the main LCD 6 and the sub LCDs 15L and 15R via the image control unit 23. The transmitter / receiver 21 demodulates the radio signal received by the antenna 4 from the above-described base station and outputs it to the control unit 20, modulates various signals output from the control unit 20, and transmits the radio signal from the antenna 4 as described above. Transmit to the base station.

  An EEPROM (Electronically Erasable and Programmable Read Only Memory) 22 stores information related to a schedule registered in the schedule function of the mobile phone 1, personal information registered in the address book function, and the like. In addition, image data acquired via the Internet, character data exchanged by e-mail, and the like are also stored. The image control unit 23 displays an image on the main LCD 6 and the sub LCDs 15L and 15R based on the image data output from the control unit 20. The audio control unit 24 converts the audio data output from the control unit 20 into an analog audio signal and outputs the analog audio signal to the speaker 5. The voice control unit 24 converts the voice input from the microphone 14 into digital data and outputs the digital data to the control unit 20.

  Further, contacts 18R and 19R for detecting the maximum drawing position of the sub LCD 15R shown in FIG. Similarly, contacts 18L and 19L for detecting the maximum drawing position of the sub LCD 15L are also connected. When these contact points are electrically connected by the metal ball MB shown in FIG. 3, the control unit 20 recognizes that the corresponding sub LCD is pulled out to the maximum pull-out position. When the sub LCD 15L or 15R recognizes that the sub LCD 15L or 15R has been pulled out to the maximum pulling position, a signal indicating the sub LCD that has been pulled out (hereinafter referred to as an active LCD signal) is output to the image control unit 23 described later. This active LCD signal has four states: a state in which no sub LCD is pulled out, a state in which only the sub LCD 15L is pulled out, a state in which only the sub LCD 15R is pulled out, and a state in which both sub LCDs are pulled out. It is a signal to represent.

  Further, the control unit 20 outputs a signal (hereinafter referred to as a display mode signal) designating a display mode (hereinafter referred to as a display mode) in a state where both of the sub LCDs 15L and 15R are pulled out to the image control unit 23. The display mode signal described above includes an enlarged display mode in which one image is integrally displayed on the main LCD 6 and the sub LCDs 15L and 15R, and a multi-screen display in which independent images are individually displayed on the main LCD 6 and the sub LCDs 15L and 15R. There is a mode. The switching between the two display modes described above is in the expanded display mode in the initial state when the sub LCDs 15L and 15R are pulled out, and each time the first command key 12 is pressed, the multi-image display mode is switched. It can be switched alternately to the extended display mode.

  Next, a detailed configuration of the above-described image control unit 23 will be described with reference to FIG. Video RAMs (image storage means) 25, 26, and 27 have storage areas corresponding to the respective pixels constituting the screens of the main LCD 6, the sub LCD 15L, and the sub LCD 15R, and store image data to be displayed on each LCD. Here, correspondence between the screen of each LCD described above and the storage area of each video RAM will be described with reference to FIG. FIG. 6A shows only the display unit 3 in the front view of the mobile phone 1 shown in FIG. FIG. 6B schematically shows storage areas of the video RAMs 25, 26, and 27. VMSL indicates the video RAM 26, VMM indicates the video RAM 25, and VMSR indicates the storage area of the video RAM 27.

  In FIG. 6A, each of the main LCD 6 and the sub LCDs 15L and 15R has m pixels in the vertical direction and n pixels in the horizontal direction. Each of the video RAMs 25, 26, and 27 has a storage area corresponding to each pixel constituting the corresponding LCD screen. However, in the mobile phone 1, when the sub LCDs 15 </ b> L and 15 </ b> R are pulled out to the maximum extent, the hatched portions in FIG. 6A are accommodated in the display unit 3. Therefore, in each of the screens of the sub LCDs 15L and 15R, a screen region having a predetermined width x from the side PS opposite to the pulling direction A out of the two vertical sides (that is, the hatched portion in FIG. 6A) ) Is invisible to the user. For this reason, among the storage areas of the video RAM 26 corresponding to the sub LCD 15L and the video RAM 27 corresponding to the sub LCD 15R, the storage areas corresponding to the pixels in the above-described screen area invisible to the user (FIG. 6B). No image data is written or read out in the hatched portion.

  Further, as described above, the interval between the screen of the main LCD 6 and the screens of the sub LCDs 15L and 15R is only the width D of the frame portion of the display unit 3, and this width D is the main LCD 6 and the sub LCDs 15L, Considering the pixel pitch of 15R, it corresponds to the number of pixels d. Therefore, when performing display in which the main LCD 6 and the sub LCDs 15L and 15R are regarded as one LCD, the display control unit 31 has m pixels in the vertical direction and N = n + 2 (nx) + 2d in the horizontal direction. Display control to display an image on the screen.

  Returning to FIG. 5, the image reduction units 28, 29, and 30 are provided corresponding to the video RAMs 25, 26, and 27, respectively. The image data supplied from the display control unit 31 to be described later is transferred to the corresponding video RAM. The storage area VMSL and the storage area VMSR of the video RAM 27 are reduced to fit in the storage area (except for the hatched portion shown in FIG. 6B), and then written into the corresponding video RAM. Note that image reduction can be realized by, for example, reduction by a conventionally known neighbor method, bilinear method, bicubic method, or affine transformation. Therefore, when the size of the image represented by the drawing data supplied from the display control unit 31 exceeds the screen size of the corresponding LCD, the image is reduced to the screen size of the LCD and displayed. The display control unit 31 outputs the image data output from the control unit 20 to the image reduction units 28, 29, and 30 according to the contents of the active sub LCD signal output from the control unit 20, or the video RAM 25, 26 and 27 are written. Further, the display control unit 31 outputs the image data written in the video RAMs 25, 26, and 27 to the corresponding LCD.

  Next, the contents of the image display control by the display control unit 31 will be described with reference to FIG. FIG. 7 is a flowchart showing the flow of image display control executed by the display control unit 31. When one of the image data, the active LCD signal, and the display mode signal is output from the control unit 20, the display control unit 31 recognizes the content of the active LCD signal at that time, and both the sub LCDs 15L and 15R It is determined whether or not it is pulled out to the maximum (step S1). If neither of the sub LCDs 15L and 15R is pulled out to the maximum, the determination result is NO, and the image data is output to the image reduction unit 28, that is, to the image reduction unit 28 corresponding to the main LCD 6 (step S1). ).

  As a result, the image reduction unit 28 reduces the image data supplied from the display control unit 31, and sequentially outputs write addresses to the video RAM 25 to write the reduced image data in the video RAM. When the writing of the image data to the video RAM 25 is completed, the display control unit 31 sequentially outputs read addresses to the video RAM 25 and causes the image data written in the video RAM 25 to be output to the main LCD 6.

  On the other hand, if both the sub LCDs 15L and 15R are pulled out to the maximum in step S1, the determination result is YES and whether the current display mode is the enlarged display mode or the multiple image display mode is based on the display mode signal. (Step S3). If it is not the enlarged display mode, in other words, if it is the multiple image display mode, the determination result is NO, and image data is output to the image reduction units 28, 29, and 30 (step S4). As a result, the image reduction units 28, 29, and 30 reduce the image data supplied from the display control unit 31 in accordance with the screen size of the corresponding LCD, and sequentially output the write address to the corresponding video RAM. Write the reduced image data. When the writing of the image data to each video RAM is completed, the image reduction units 28, 29, and 30 sequentially output read addresses to the corresponding video RAM, and the image data written to the corresponding video RAM. Are output to the corresponding LCD.

  In step S3 described above, if the current display mode is the enlarged display mode, the determination result is YES, and the display control unit 31 regards the main LCD 6 and the sub LCDs 15L and 15R as one LCD, Address data is sequentially generated for the LCD, and the image data supplied from the control unit 20 is written in each of the video RAMs 25, 26 and 27. When the writing of the image data is completed, read addresses are sequentially output to the video RAMs 25, 26, and 27, and the image data written in each video RAM is output to the corresponding LCD.

  Next, a display mode of an image displayed on the main LCD 6, or the main LCD 6 and the sub LCDs 15L and 15R by the above-described image display control will be described with reference to FIGS. Here, FIG. 8 is displayed on the main LCD 6 by the process of step S2 when the sub LCDs 15L and 15R are housed in the display unit 3 (FIG. 7, step S1, NO) in the image display control shown in FIG. It is a figure which shows an example of the image performed. In this case, for example, if image data corresponding to the number of vertical m pixels and the number of horizontal N pixels shown in FIG. 8A is output from the control unit 20 to the display control unit 31, the display control unit 31 The image data is output to the image reduction unit 28. In the image reduction unit 28, the horizontal size of the input image data is reduced in accordance with the horizontal size on the screen of the main LCD 6, written into the video RAM 25, and displayed on the main LCD 6. As a result, as shown in FIG. 8B, the main LCD 6 displays an image in which the horizontal direction of the image data in FIG. Here, in the display screen shown in FIG. 8B, the mark M shown at the lower right is for indicating that the image displayed on the main LCD 6 is compressed, and this mark M The image data is written into the video RAM 25 by the image reduction unit 28.

  9 shows that the sub LCDs 15L and 15R are pulled out in the image display control shown in FIG. 7 (FIG. 7, step S1, YES), and the enlarged display mode is designated (FIG. 7, step S3). , YES) is a diagram showing an example of an image displayed on the main LCD 6 and the sub LCDs 15L and 15R by the process of step S5. In this case, for example, image data (see FIG. 9A) corresponding to the number of vertical m pixels and the number of horizontal N pixels similar to FIG. 8A is output from the control unit 20 to the display control unit 31. As shown in FIG. 9B, the display control unit 31 converts the image data of the image area A into the hatched portion shown in FIG. 9B of the storage area VMSL of the video RAM 26, as shown in FIG. 9 is written, the image data of the image area A is written to the storage area VMM of the video RAM 25, and the image data of the image area c is stored in the storage area VMSR of the video RAM 27 other than the hatched portion shown in FIG. Write to each storage area. When the writing of each image data is completed, the display control unit 31 sequentially outputs a read address to each video RAM. As a result, as shown in FIG. 9C, the image data of FIG. 9A is integrally displayed on the main LCD 6 and the sub LCDs 15L and 15R.

  Further, FIG. 10 shows that the sub LCDs 15L and 15R are pulled out in the image display control shown in FIG. 7 (FIG. 7, step S1, YES) and the multi-screen display mode is designated (FIG. 7, step (S3, NO) is a diagram showing an example of an image displayed on the main LCD 6 and sub LCDs 15L and 15R by the process of step S4. In this case, for example, if image data corresponding to the number of vertical m × 3 pixels and the number of horizontal N pixels is output from the control unit 20 to the display control unit 31 as shown in FIG. The control unit 31 divides the image data by the number of m pixels in the vertical direction and divides the image data into image areas K, K, and K, and the image data corresponding to the image area K is sent to the image reduction unit 29 and the image area K. The image data to be processed is output to the image reduction unit 28, and the image data corresponding to the image area is output to the image reduction unit 30, respectively. Each of the image reduction units 28, 29, and 30 reduces the size of the input image data in the horizontal direction according to the horizontal size of the corresponding LCD screen. Then, the data is written in the corresponding video RAM and displayed on each LCD. As a result, as shown in FIG. 10B, the image corresponding to the image area of the image data shown in FIG. 10A is reduced in the horizontal direction on the screen 16L of the sub LCD 15L. Is displayed. In addition, on the screen of the main LCD 6, an image corresponding to the image area key among the image data shown in FIG. 10A is displayed in a reduced state in the horizontal direction. Further, on the screen 16R of the sub LCD 15R, the image corresponding to the image area is displayed in the state reduced in the horizontal direction among the image data shown in FIG. Further, as shown in FIG. 10B, a mark M indicating that the image displayed on each screen is compressed is displayed on the lower right side of each screen of the main LCD 6 and the sub LCDs 15L and 15R. . The image data of the mark M is written into the video RAMs 25, 26, and 27 by the image reduction units 28, 29, and 30, respectively.

  As described above, according to the mobile phone according to the present embodiment, even when the sub LCDs 15L and 15R are pulled out to the maximum extent, a part of each sub LCD is housed in the display unit 3. Therefore, the strength for supporting the sub LCDs 15L and 15R is increased. Further, since the space between the screen of the main LCD 6 and the screens 16L and 16R of the sub LCDs 15L and 15R is only the width D of the frame portion of the main LCD 6, the space between the screens can be reduced. For this reason, even when one image is displayed on the main LCD 6 and the sub LCDs 15L and 15R, it is possible to display an image with a sense of unity. For example, as shown in FIG. 8B, when the sub LCDs 15L and 15R are pulled out while displaying an image only on the main LCD 6, the control unit 20 outputs an active LCD signal indicating that effect. Accordingly, the display control unit 31 executes the image display control shown in FIG. 7 again. For example, when the display mode signal indicates the enlarged display mode, the image display shown in FIG. Switch to the image display shown in c). For this reason, when the sub LCDs 15L and 15R are pulled out, an operation for switching the image display becomes unnecessary, and the labor of the user is reduced.

  In addition, when the sub LCDs 15L and 15R are pulled out to the maximum shown in FIG. 2, the predetermined width w that remains in the display unit 3 maintains the support strength of the sub LCDs 15L and 15R. If possible, for example, as shown in FIG. 11, at least the frame FL part (non-display area) on the display unit 3 side of the sub LCDs 15L and 15R may be accommodated in the display unit 3. In the present embodiment, the screen size of the main LCD 6 and the screen sizes of the sub LCDs 15L and 15R are the same. However, the screen sizes of both are not necessarily the same. For example, the sub LCDs 15L and 15R have the same length in the vertical direction on the screen of the main LCD 6 and the sub LCDs 15L and 15R, but the horizontal length of the sub LCDs 15L and 15R is shorter than that of the main LCD 6. The screen may be smaller than the screen of the main LCD 6. For example, as described with reference to FIG. 8, when displaying image data having a size exceeding the screen size of the LCD, the image data is reduced in accordance with the screen size of the LCD. The image data may be displayed in a scrollable manner without reducing the size of the image data. Further, in the present embodiment, when both the sub LCDs 15L and 15R are pulled out, the display in the enlarged display mode or the multi-screen display mode is enabled. However, when either the sub LCD 15L or 15R is pulled out. The display in the enlarged display mode or the multi-screen display mode may be performed by the two LCDs together with the main LCD 6. Furthermore, the mobile phone 1 may be provided with a digital camera function, and an image photographed by the digital camera function may be displayed in each of the display modes described above.

It is the front view and side view which show the external appearance of the mobile telephone in embodiment of this invention. It is the front which shows the state which pulled out the sub LCD accommodated in the inside of the mobile phone. It is explanatory drawing for demonstrating the structure of the detection means which detects the state from which the same sub LCD was pulled out. It is a block diagram which shows the internal structure of the mobile telephone in embodiment of this invention. 3 is a block diagram showing a detailed configuration of an image control unit which is a part of the internal hardware configuration of the mobile phone. FIG. 4 is an explanatory diagram for explaining an effective storage area of a video RAM corresponding to each LCD provided in the mobile phone. FIG. 4 is a flowchart showing processing contents of image display control in the mobile phone. 4 is an explanatory diagram for explaining an example of an image display mode in the mobile phone. FIG. 4 is an explanatory diagram for explaining an example of an image display mode in the mobile phone. FIG. 4 is an explanatory diagram for explaining an example of an image display mode in the mobile phone. FIG. It is a front view which shows another form about the largest pull-out amount of sub LCD in the same mobile phone.

Explanation of symbols

1 Cellular phone 3 Display unit 6 Liquid crystal image display devices 15L, 15R Sub LCD
18L, 18R, 19L, 19R Terminal 20 Control unit 23 Image control unit 25, 26, 27 Video RAM
31 Display control unit

Claims (3)

A mobile phone that communicates with the outside,
A first image display device having a display screen for displaying an image and a frame portion surrounding the display screen;
A display screen for displaying an image and a frame portion surrounding the display screen, provided at a position hidden on the back side of the first image display device, and slid in the horizontal direction of the display screen of the first image display device A second image display device that can be pulled out by
An image display control unit that integrally displays one image on the display screen of the first and second image display devices when the second image display device is pulled out;
The display screen of the second image display device is in a position parallel to the display screen of the first image display device when pulled out, and at least when the second image display device is pulled out to the maximum extent, A cellular phone, wherein the frame portion of the second image display device remains hidden behind the first image display device. Detecting means for detecting a state in which the second image display device is pulled out;
The display control unit
When the state where the second image display device is pulled out is not detected by the detection means, an image is displayed only by the first image display device,
When the detection unit detects a state in which the second image display device is pulled out, the image displayed on the first image display device is integrated with the screens of the first and second image display devices. The mobile phone according to claim 1, wherein the mobile phone is displayed. The image display control unit
A first image having a storage area corresponding to each pixel constituting the display screen of the first image display device, and storing image data to be displayed on the display screen of the first image display device in the storage area Storage means;
A second image having a storage area corresponding to each pixel constituting the display screen of the second image display device, and storing image data to be displayed on the display screen of the second image display device in the storage area Storage means, and
The second image storage corresponding to a pixel corresponding to a display screen area having a predetermined width from a side opposite to the pull-out direction, out of two sides in the vertical direction on the display screen of the second image display device. The mobile phone according to claim 1 or 2, wherein image data to be displayed on the screen of the second image display device is stored in a storage area other than the storage area in the means.

Images